Adjustable Heat Sink Retention for Variable Spring Sizes

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Solution Overview

Problem

Existing heat sink assemblies face challenges in securely retaining heat sinks with springs to electronic devices on printed circuit boards (PCBs), particularly due to variations in spring sizes and potential pre-deformation during installation.

Innovation Solution

An adjustable retention device is provided, comprising a two-piece or three-piece setup with components that can be attached to a PCB and adjustably locked to retain a portion of the spring, allowing for application of force to secure the heat sink proximate the electronic device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed retention device is used to attach heat sink to electronic device, then the heat sink can be retained, but the device lacks flexibility to accommodate springs of varying sizes and may cause pre-deformation

Engineering Contradiction:

Improveflexibility to accommodate springs of varying sizesVSAvoidcomplexity of retention device structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The retention device is divided into multiple segments or adjustable components that can be configured to different positions. The retention arm includes multiple retention positions that can be selectively engaged to accommodate springs of different sizes, providing adaptability without requiring a completely different device for each spring size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The retention device incorporates dynamic adjustability, allowing the retention arm to be moved between multiple retention positions during installation. This dynamic capability enables the same device to adapt to varying spring sizes while maintaining proper force application and preventing pre-deformation.

Inventive Principle:

Principle #15Dynamics

2Strength

If rigid retention method is used to secure heat sink, then strong attachment is achieved, but shock and vibration damage may occur

Engineering Contradiction:

Improveattachment strengthVSAvoidshock and vibration damage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The retention device incorporates a compliant element or damping mechanism that provides cushioning before shock or vibration occurs. This beforehand cushioning protects the electronic device and heat sink from damage by absorbing or attenuating sudden forces during operation or installation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The retention device uses flexible or compliant materials in the retention arm or connection elements. These flexible components provide both the necessary attachment strength and the ability to absorb shock and vibration, preventing damage while maintaining secure heat sink retention.

Inventive Principle:

Principle #30Flexible shells and thin films

3Ease of manufacture

If spring force is applied directly without adjustment mechanism, then simple installation is achieved, but unbalanced loads may damage modules or chips

Engineering Contradiction:

Improvesimplicity of installationVSAvoidrisk of damage from unbalanced loads

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The retention device divides the force application into multiple discrete retention positions along the retention arm. By selecting the appropriate retention position, the installer can adjust the leverage and force distribution to achieve balanced loads on the electronic device, preventing damage while maintaining relatively simple installation procedures.

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The adjustable retention device ensures secure retention of heat sinks with springs, accommodating different spring sizes and preventing pre-deformation, while also providing a damping effect against shock and vibration through an elastomeric layer.

Implementation Method 1

incorporating an elastomeric layer for shock and vibration damping

Methodology Applied

Scientific EffectShock and vibration damping: Damping

Implementation Method 2

a spring, proximate an electronic device in a circuit board

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 3

allow application of a force on the spring in order to retain the heat sink

Methodology Applied

Scientific EffectSpring force: Spring

Data Source

PatentUS12207446B2Adjustable retention device for heat sink assembly

Publication Date: 2025.01.21 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

A heat sink retention device for retaining a heat sink, including a spring, proximate an electronic device in a circuit board. The device includes a first component configured to be attached to a circuit board, and a second component configured to be adjustably attached to the first component, and including an opening configured to retain a portion of a spring of a heat sink. When the first and second components are attached together and the first component is attached to the circuit board, the heat sink retention device is adapted to allow application of a force on the spring in order to retain the heat sink proximate an electronic device mounted on the circuit board.